Back in December, I picked up a BCM extractor spring upgrade. The upgrade came with the new insert, coil, and o-ring. I've used it with the O-ring, but I notice that the end of the .223 and 5.56 casings (after the round's been fired) is getting scraped/gouged. This is a Stag upper with a standard stag/CMT bolt carrier. Before I got the extractor spring upgrade, only the 5.56 casings were getting scraped (this is with the blue insert and old spring). I heard somewhere that the O-ring might play a role in this, but I'm not really sure. If the O-ring is part of the cause, should I retain the O-ring, or should I remove it? If memory serves me right, I think using a H-buffer might help as well, but since I also shoot lighter loads, I want to keep my current carbine buffer. This probably isn't too big of an issue, but I want to save the casings because I have friends that reload.
Below are pictures of Sellier and Bellot .223 FMJ (55gr) and Winchester 5.56 FMJ (55gr).
S&B .223
Winchester 5.56
Thanks in advance.




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